Gary Aitken writes:

Humor me, and try the following:

Scenario 1:

Load a raw image into ufraw with some feature for which you can tell a difference when a profile is applied.

Apply the profile in ufraw. Save the file as .tif

Start gimp. Go to Edit/Preferences/ColorManagement Make sure RGB Profile is set to "None" Load the .tif image.
It should look as the corrected image, i.e. profile applied. Go to Edit/Preferences/ColorManagement Check RGB Profile
It still says "None"
ok so far
Presumably the profile used is the one embedded in the .tif image. But there is no way of knowing what that profile is or whether it has been applied that I can figure out.

When I apply an Output Profile in UFRaw and send to GIMP, GIMP asks me whether to keep the embedded profile or convert to sRGB, so I do know that it's noticing a profile there. You can set GIMP to ask on the bottom drop-down of that menu.

Also, just to check "if it's plugged in", if you run ImageMagick's "identify -verbose myfile.tif", does it have a section like

Profile-icc: 3004 bytes Description: Pink
Manufacturer: IEC http://www.iec.ch Model: IEC 61966-2.1 Default RGB colour space - sRGB Copyright: Copyright (c) 1998 Hewlett-Packard Company Modified using Adobe Gamma

?

Or, if you click Image→Image Properties (alternatively: Image→Mode→Set/Convert Colour Profile), does it say that the current one is sRGB built-in, or that it is YourProfileName?

Now set the RGB Profile to the one you used in ufraw when generating the .tif image.
You will see the image transformed again. In effect, the profile is being applied twice.

I don't see this. What I do see is that no matter what crazy embedded Output Profile I use in UFRaw (and I select "keep embedded" in GIMP), changing the RGB Profile in that part of GIMP doesn't change what the image looks like, and they all look the same no matter what profile they have (or even if they don't have a profile).

However, if I open an image without an embedded profile, clicking Image→Image Properties tells me that the profile is "sRGB built-in", and if I have RGB Profile set to something weird in Preferences then, the image gets weird colours.

Tested using UFRaw version 0.18, GIMP version 2.7.4, on Arch Linux.

BTW, I'm using gimp 2.7.5 (2.8 preview); I don't know if this is specific to 2.7.5 or not. It may also be that these are temporary issues with the transition to full color management and 16bit colors. But if they are issues not already on the gimp development plate, they should probably be raised so they are at least well-known.

Ah. Perhaps the difference is to do with Windows?

Gary Aitken writes:

On 2/1/2012 12:08 AM, Kevin Brubeck Unhammer wrote:

When I apply an Output Profile in UFRaw and send to GIMP, GIMP asks me whether to keep the embedded profile or convert to sRGB, so I do know that it's noticing a profile there. You can set GIMP to ask on the bottom drop-down of that menu.

I don't see any dialog at all. The image just appears in the gimp image window.

Also, just to check "if it's plugged in", if you run ImageMagick's "identify -verbose myfile.tif", does it have a section like

Profile-icc: 3004 bytes Description: Pink
Manufacturer: IEC http://www.iec.ch Model: IEC 61966-2.1 Default RGB colour space - sRGB Copyright: Copyright (c) 1998 Hewlett-Packard Company Modified using Adobe Gamma

?

Or, if you click Image→Image Properties (alternatively: Image→Mode→Set/Convert Colour Profile), does it say that the current one is sRGB built-in, or that it is YourProfileName?

It says the profile is "sRGB built-in, Default RGB working space" but it displays with the profile applied in ufraw.

The Display profile in UFRaw is not embedded, the output profile (middle of the three) is. No matter what output profile you select, the preview in UFRaw shouldn't change, if I understand things correctly.

Edit/Preferences/Color Management shows no profile for RGB.

Now set the RGB Profile to the one you used in ufraw when generating the .tif image.
You will see the image transformed again. In effect, the profile is being applied twice.

I don't see this. What I do see is that no matter what crazy embedded Output Profile I use in UFRaw (and I select "keep embedded" in GIMP), changing the RGB Profile in that part of GIMP doesn't change what the image looks like, and they all look the same no matter what profile they have (or even if they don't have a profile).

However, if I open an image without an embedded profile, clicking Image→Image Properties tells me that the profile is "sRGB built-in", and if I have RGB Profile set to something weird in Preferences then, the image gets weird colours.

Tested using UFRaw version 0.18, GIMP version 2.7.4, on Arch Linux.

BTW, I'm using gimp 2.7.5 (2.8 preview); I don't know if this is specific to 2.7.5 or not. It may also be that these are temporary issues with the transition to full color management and 16bit colors. But if they are issues not already on the gimp development plate, they should probably be raised so they are at least well-known.

Ah. Perhaps the difference is to do with Windows?

dangit.
Could be windoze related;
or something that creeped in between 2.7.4 and 2.7.5. Anyone running 2.7.5 on any os who can confirm 2.7.5 behavior one way or the other?

Ugh. Global .gimprc says #(color-profile-policy ask)
my .gimprc says
(color-profile-policy convert)
which I don't believe I ever set, but I could be lying.

I now see, at bottom of preferences/color management, option to ask, keep, or discard (convert)

However... I changed it to "keep",
exited,
my .gimprc now says keep
The image comes across with the profile, but image/properties still says sRGB default.
Change it to ask and the behavior is the same -- I still don't get a dialog, and it still says the profile is the default despite the original one being applied.

Can you use a third program to ensure that the colour profile is actually embedded and not just destructively applied? I guess ImageMagick is not as simple to use on Windows, though you could try just uploading it to http://regex.info/exif.cgi which runs ImageMagick etc. for you, if you feel alright uploading it to random websites …